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* [PATCH v8 0/3] media: ov8856: Add devicetree support
@ 2020-05-11 11:03 ` Robert Foss
  0 siblings, 0 replies; 12+ messages in thread
From: Robert Foss @ 2020-05-11 11:03 UTC (permalink / raw)
  To: Andy Shevchenko, Sakari Ailus, Marco Felsch, Maxime Ripard,
	linux-media, devicetree, linux-kernel, linux-arm-kernel
  Cc: Dongchun Zhu, Fabio Estevam, Tomasz Figa, Ben Kao, Robert Foss

This adds devicetree support to the ov8856 driver.
In order to to aid debugging and enable future sensor
modes to be supported, module revision detection is also added.

Dongchun Zhu (1):
  media: dt-bindings: ov8856: Document YAML bindings

Robert Foss (2):
  media: ov8856: Add devicetree support
  media: ov8856: Implement sensor module revision identification

 .../devicetree/bindings/media/i2c/ov8856.yaml | 142 +++++++++++++
 MAINTAINERS                                   |   3 +-
 drivers/media/i2c/ov8856.c                    | 191 ++++++++++++++++--
 3 files changed, 321 insertions(+), 15 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/media/i2c/ov8856.yaml

-- 
2.25.1


^ permalink raw reply	[flat|nested] 12+ messages in thread
* [PATCH v8 0/3] media: ov8856: Add devicetree support
@ 2020-05-11 11:03 ` Robert Foss
  0 siblings, 0 replies; 12+ messages in thread
From: Robert Foss @ 2020-05-11 11:03 UTC (permalink / raw)
  To: Andy Shevchenko, Sakari Ailus, Marco Felsch, Maxime Ripard,
	linux-media, devicetree, linux-kernel, linux-arm-kernel
  Cc: Ben Kao, Fabio Estevam, Dongchun Zhu, Robert Foss, Tomasz Figa

This adds devicetree support to the ov8856 driver.
In order to to aid debugging and enable future sensor
modes to be supported, module revision detection is also added.

Dongchun Zhu (1):
  media: dt-bindings: ov8856: Document YAML bindings

Robert Foss (2):
  media: ov8856: Add devicetree support
  media: ov8856: Implement sensor module revision identification

 .../devicetree/bindings/media/i2c/ov8856.yaml | 142 +++++++++++++
 MAINTAINERS                                   |   3 +-
 drivers/media/i2c/ov8856.c                    | 191 ++++++++++++++++--
 3 files changed, 321 insertions(+), 15 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/media/i2c/ov8856.yaml

-- 
2.25.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply	[flat|nested] 12+ messages in thread
* [PATCH v11 1/3] media: dt-bindings: ov8856: Document YAML bindings
  2020-05-11 11:03 ` Robert Foss
@ 2020-05-11 11:03   ` Robert Foss
  -1 siblings, 0 replies; 12+ messages in thread
From: Robert Foss @ 2020-05-11 11:03 UTC (permalink / raw)
  To: Andy Shevchenko, Sakari Ailus, Marco Felsch, Maxime Ripard,
	linux-media, devicetree, linux-kernel, linux-arm-kernel
  Cc: Dongchun Zhu, Fabio Estevam, Tomasz Figa, Ben Kao, Robert Foss,
	Maxime Ripard, Rob Herring

From: Dongchun Zhu <dongchun.zhu@mediatek.com>

This patch adds documentation of device tree in YAML schema for the
OV8856 CMOS image sensor.

Signed-off-by: Dongchun Zhu <dongchun.zhu@mediatek.com>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
---

- Changes since v10:
  * Dongchun: Sort by maintainers entry by file name
  * Rob: Added r-b
  * Sakari: List Dongchun as the maintainer


- Changes since v9:
  * Remove remote-endpoint property
  * Marco: Make port property required again
  * Sakari: Remove Ben as a maintainer
  * Sakari: Replace data-lanes with const items
  * Sakari: Remove clock-lanes property
  * Sakari & Rob Herring: Change type of link-frequency
    work around dt-schema bug

- Changes since v8:
  * Maxime: Added r-b

- Changes since v7:
  * Marco: Make 'port' property optional
  * Maxime & Sakari: Add 'link-frequencies' property to dt binding
  * Rob: Improve description for 'port' property

- Changes since v6:
  * Marco: remove qcom specifics from DT example
   
- Changes since v5:
  * Add assigned-clocks and assigned-clock-rates
  * Rob: dt-schema errors

- Changes since v4:
  * Fabio: Change reset-gpio to GPIO_ACTIVE_LOW, explain in description
  * Add clock-lanes property to example
  * Rob: Fix syntax error in devicetree example

- Changes since v3:
  * robher: Fix syntax error
  * robher: Removed maxItems
  * Fixes yaml 'make dt-binding-check' errors

- Changes since v2:

- Changes since v1:
  Fixes comments from Sakari, Tomasz
  * Add clock-frequency and link-frequencies in DT

 .../devicetree/bindings/media/i2c/ov8856.yaml | 142 ++++++++++++++++++
 MAINTAINERS                                   |   3 +-
 2 files changed, 144 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/media/i2c/ov8856.yaml

diff --git a/Documentation/devicetree/bindings/media/i2c/ov8856.yaml b/Documentation/devicetree/bindings/media/i2c/ov8856.yaml
new file mode 100644
index 000000000000..d6af685ad3ca
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/ov8856.yaml
@@ -0,0 +1,142 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright (c) 2019 MediaTek Inc.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/media/i2c/ov8856.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Omnivision OV8856 CMOS Sensor Device Tree Bindings
+
+maintainers:
+  - Dongchun Zhu <dongchun.zhu@mediatek.com>
+
+description: |-
+  The Omnivision OV8856 is a high performance, 1/4-inch, 8 megapixel, CMOS
+  image sensor that delivers 3264x2448 at 30fps. It provides full-frame,
+  sub-sampled, and windowed 10-bit MIPI images in various formats via the
+  Serial Camera Control Bus (SCCB) interface. This chip is programmable
+  through I2C and two-wire SCCB. The sensor output is available via CSI-2
+  serial data output (up to 4-lane).
+
+properties:
+  compatible:
+    const: ovti,ov8856
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    description:
+      Input clock for the sensor.
+    items:
+      - const: xvclk
+
+  clock-frequency:
+    description:
+      Frequency of the xvclk clock in Hertz.
+
+  dovdd-supply:
+    description:
+      Definition of the regulator used as interface power supply.
+
+  avdd-supply:
+    description:
+      Definition of the regulator used as analog power supply.
+
+  dvdd-supply:
+    description:
+      Definition of the regulator used as digital power supply.
+
+  reset-gpios:
+    description:
+      The phandle and specifier for the GPIO that controls sensor reset.
+      This corresponds to the hardware pin XSHUTDOWN which is physically
+      active low.
+
+  port:
+    type: object
+    additionalProperties: false
+    description:
+      A node containing an output port node with an endpoint definition
+      as documented in
+      Documentation/devicetree/bindings/media/video-interfaces.txt
+
+    properties:
+      endpoint:
+        type: object
+
+        properties:
+          data-lanes:
+            description: |-
+              The driver only supports four-lane operation.
+            items:
+              - const: 1
+              - const: 2
+              - const: 3
+              - const: 4
+
+          link-frequencies:
+            allOf:
+              - $ref: /schemas/types.yaml#/definitions/uint64-array
+            description:
+              Allowed data bus frequencies. 360000000, 180000000 Hz or both
+              are supported by the driver.
+
+
+        required:
+          - link-frequencies
+
+    required:
+      - endpoint
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - clock-frequency
+  - dovdd-supply
+  - avdd-supply
+  - dvdd-supply
+  - reset-gpios
+  - port
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        ov8856: camera@10 {
+            compatible = "ovti,ov8856";
+            reg = <0x10>;
+
+            reset-gpios = <&pio 111 GPIO_ACTIVE_LOW>;
+            pinctrl-names = "default";
+            pinctrl-0 = <&clk_24m_cam>;
+
+            clocks = <&cam_osc>;
+            clock-names = "xvclk";
+            clock-frequency = <19200000>;
+
+            avdd-supply = <&mt6358_vcama2_reg>;
+            dvdd-supply = <&mt6358_vcamd_reg>;
+            dovdd-supply = <&mt6358_vcamio_reg>;
+
+            port {
+                wcam_out: endpoint {
+                    remote-endpoint = <&mipi_in_wcam>;
+                    data-lanes = <1 2 3 4>;
+                    link-frequencies = /bits/ 64 <360000000>;
+                };
+            };
+        };
+    };
+...
\ No newline at end of file
diff --git a/MAINTAINERS b/MAINTAINERS
index 26f281d9f32a..2bc8555a980e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -12484,10 +12484,11 @@ F:	Documentation/devicetree/bindings/media/i2c/ov7740.txt
 F:	drivers/media/i2c/ov7740.c
 
 OMNIVISION OV8856 SENSOR DRIVER
-M:	Ben Kao <ben.kao@intel.com>
+M:	Dongchun Zhu <dongchun.zhu@mediatek.com>
 L:	linux-media@vger.kernel.org
 S:	Maintained
 T:	git git://linuxtv.org/media_tree.git
+F:	Documentation/devicetree/bindings/media/i2c/ov8856.yaml
 F:	drivers/media/i2c/ov8856.c
 
 OMNIVISION OV9640 SENSOR DRIVER
-- 
2.25.1


^ permalink raw reply related	[flat|nested] 12+ messages in thread
* [PATCH v11 1/3] media: dt-bindings: ov8856: Document YAML bindings
@ 2020-05-11 11:03   ` Robert Foss
  0 siblings, 0 replies; 12+ messages in thread
From: Robert Foss @ 2020-05-11 11:03 UTC (permalink / raw)
  To: Andy Shevchenko, Sakari Ailus, Marco Felsch, Maxime Ripard,
	linux-media, devicetree, linux-kernel, linux-arm-kernel
  Cc: Rob Herring, Robert Foss, Maxime Ripard, Tomasz Figa, Ben Kao,
	Dongchun Zhu, Fabio Estevam

From: Dongchun Zhu <dongchun.zhu@mediatek.com>

This patch adds documentation of device tree in YAML schema for the
OV8856 CMOS image sensor.

Signed-off-by: Dongchun Zhu <dongchun.zhu@mediatek.com>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
---

- Changes since v10:
  * Dongchun: Sort by maintainers entry by file name
  * Rob: Added r-b
  * Sakari: List Dongchun as the maintainer


- Changes since v9:
  * Remove remote-endpoint property
  * Marco: Make port property required again
  * Sakari: Remove Ben as a maintainer
  * Sakari: Replace data-lanes with const items
  * Sakari: Remove clock-lanes property
  * Sakari & Rob Herring: Change type of link-frequency
    work around dt-schema bug

- Changes since v8:
  * Maxime: Added r-b

- Changes since v7:
  * Marco: Make 'port' property optional
  * Maxime & Sakari: Add 'link-frequencies' property to dt binding
  * Rob: Improve description for 'port' property

- Changes since v6:
  * Marco: remove qcom specifics from DT example
   
- Changes since v5:
  * Add assigned-clocks and assigned-clock-rates
  * Rob: dt-schema errors

- Changes since v4:
  * Fabio: Change reset-gpio to GPIO_ACTIVE_LOW, explain in description
  * Add clock-lanes property to example
  * Rob: Fix syntax error in devicetree example

- Changes since v3:
  * robher: Fix syntax error
  * robher: Removed maxItems
  * Fixes yaml 'make dt-binding-check' errors

- Changes since v2:

- Changes since v1:
  Fixes comments from Sakari, Tomasz
  * Add clock-frequency and link-frequencies in DT

 .../devicetree/bindings/media/i2c/ov8856.yaml | 142 ++++++++++++++++++
 MAINTAINERS                                   |   3 +-
 2 files changed, 144 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/media/i2c/ov8856.yaml

diff --git a/Documentation/devicetree/bindings/media/i2c/ov8856.yaml b/Documentation/devicetree/bindings/media/i2c/ov8856.yaml
new file mode 100644
index 000000000000..d6af685ad3ca
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/ov8856.yaml
@@ -0,0 +1,142 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright (c) 2019 MediaTek Inc.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/media/i2c/ov8856.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Omnivision OV8856 CMOS Sensor Device Tree Bindings
+
+maintainers:
+  - Dongchun Zhu <dongchun.zhu@mediatek.com>
+
+description: |-
+  The Omnivision OV8856 is a high performance, 1/4-inch, 8 megapixel, CMOS
+  image sensor that delivers 3264x2448 at 30fps. It provides full-frame,
+  sub-sampled, and windowed 10-bit MIPI images in various formats via the
+  Serial Camera Control Bus (SCCB) interface. This chip is programmable
+  through I2C and two-wire SCCB. The sensor output is available via CSI-2
+  serial data output (up to 4-lane).
+
+properties:
+  compatible:
+    const: ovti,ov8856
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    description:
+      Input clock for the sensor.
+    items:
+      - const: xvclk
+
+  clock-frequency:
+    description:
+      Frequency of the xvclk clock in Hertz.
+
+  dovdd-supply:
+    description:
+      Definition of the regulator used as interface power supply.
+
+  avdd-supply:
+    description:
+      Definition of the regulator used as analog power supply.
+
+  dvdd-supply:
+    description:
+      Definition of the regulator used as digital power supply.
+
+  reset-gpios:
+    description:
+      The phandle and specifier for the GPIO that controls sensor reset.
+      This corresponds to the hardware pin XSHUTDOWN which is physically
+      active low.
+
+  port:
+    type: object
+    additionalProperties: false
+    description:
+      A node containing an output port node with an endpoint definition
+      as documented in
+      Documentation/devicetree/bindings/media/video-interfaces.txt
+
+    properties:
+      endpoint:
+        type: object
+
+        properties:
+          data-lanes:
+            description: |-
+              The driver only supports four-lane operation.
+            items:
+              - const: 1
+              - const: 2
+              - const: 3
+              - const: 4
+
+          link-frequencies:
+            allOf:
+              - $ref: /schemas/types.yaml#/definitions/uint64-array
+            description:
+              Allowed data bus frequencies. 360000000, 180000000 Hz or both
+              are supported by the driver.
+
+
+        required:
+          - link-frequencies
+
+    required:
+      - endpoint
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - clock-frequency
+  - dovdd-supply
+  - avdd-supply
+  - dvdd-supply
+  - reset-gpios
+  - port
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        ov8856: camera@10 {
+            compatible = "ovti,ov8856";
+            reg = <0x10>;
+
+            reset-gpios = <&pio 111 GPIO_ACTIVE_LOW>;
+            pinctrl-names = "default";
+            pinctrl-0 = <&clk_24m_cam>;
+
+            clocks = <&cam_osc>;
+            clock-names = "xvclk";
+            clock-frequency = <19200000>;
+
+            avdd-supply = <&mt6358_vcama2_reg>;
+            dvdd-supply = <&mt6358_vcamd_reg>;
+            dovdd-supply = <&mt6358_vcamio_reg>;
+
+            port {
+                wcam_out: endpoint {
+                    remote-endpoint = <&mipi_in_wcam>;
+                    data-lanes = <1 2 3 4>;
+                    link-frequencies = /bits/ 64 <360000000>;
+                };
+            };
+        };
+    };
+...
\ No newline at end of file
diff --git a/MAINTAINERS b/MAINTAINERS
index 26f281d9f32a..2bc8555a980e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -12484,10 +12484,11 @@ F:	Documentation/devicetree/bindings/media/i2c/ov7740.txt
 F:	drivers/media/i2c/ov7740.c
 
 OMNIVISION OV8856 SENSOR DRIVER
-M:	Ben Kao <ben.kao@intel.com>
+M:	Dongchun Zhu <dongchun.zhu@mediatek.com>
 L:	linux-media@vger.kernel.org
 S:	Maintained
 T:	git git://linuxtv.org/media_tree.git
+F:	Documentation/devicetree/bindings/media/i2c/ov8856.yaml
 F:	drivers/media/i2c/ov8856.c
 
 OMNIVISION OV9640 SENSOR DRIVER
-- 
2.25.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply related	[flat|nested] 12+ messages in thread
* [PATCH v8 2/3] media: ov8856: Add devicetree support
  2020-05-11 11:03 ` Robert Foss
@ 2020-05-11 11:03   ` Robert Foss
  -1 siblings, 0 replies; 12+ messages in thread
From: Robert Foss @ 2020-05-11 11:03 UTC (permalink / raw)
  To: Andy Shevchenko, Sakari Ailus, Marco Felsch, Maxime Ripard,
	linux-media, devicetree, linux-kernel, linux-arm-kernel
  Cc: Dongchun Zhu, Fabio Estevam, Tomasz Figa, Ben Kao, Robert Foss

Add match table, enable ov8856_probe() to support
both ACPI and DT modes.

ACPI and DT modes are primarily distinguished from
by checking for ACPI mode and by having resource like
be NULL.

Signed-off-by: Robert Foss <robert.foss@linaro.org>
---

- Changes since v7:
  * Marco: Align split line
  * Marco: Early escape during __ov8856_power_off for ACPI mode
  * Marco: Remove dev ptr from struct ov8856

- Changes since v6:
  * Marco: Bail out of __ov8856_power_on earlier if ACPI mode

- Changes since v5:
  * Maxime & Sakari: Replaced clock tolerance check with warning

- Changes since v4:
  * Maxime & Sakari: Switch to clock-frequency

- Changes since v3:
  * Remove redundant {}-brackets
  * Compare xvclk_rate to 5% tolerance
  * Andy: Use dev_fwnode()
  * Andy: Use %pe instead of %ld + PTR_ERR()
  * Andy: Invert reset_gpio logic
  * Andy: Remove dev_dbg() from failing reset_gpio setup
  * Andy: Use dev_err for logging for failures
  * Andy: Remove dev_warn from EDEFER/regulator error path
  * Andy & Sakari: Replaced GPIOD_OUT_XXX with 0/1
  * Maxime & Sakari: Verify clock frequency from DT
  * Sakari: Verify the 'xvclk_rate' is set correctly for ACPI/DT devices
  * Sakari: Remove duplicate ov8856->dev assignment

- Changes since v2:
  * Added "struct device *dev" member to struct ov8856
  * Andy: Switch to optional version of devm_gpiod_get
  * Andy: Switch to optional version of devm_clk_get
  * Fabio: Add reset sleep period
  * Sakari: Unify defines for 19.2Mhz
  * Sakari: Remove 24Mhz clock, since it isn't needed for supported modes
  * Sakari: Replace dev_info() with dev_dbg()
  * Sakari: Switch induction variable type to unsigned
  * Sakari: Don't wait for reset_gpio when in ACPI mode
  * Sakari: Pull reset GPIO high on power on failure
  * Sakari: Add power on/off to resume/suspend
  * Sakari: Fix indentation
  * Sakari: Power off during ov8856_remove()
  * Sakari: Don't sleep during power-on in ACPI mode
  * Sakari: Switch to getting xvclk from clk_get_rate

- Changes since v1:
  * Andy & Sakari: Make XVCLK optional since to not break ACPI
  * Fabio: Change n_shutdown_gpio name to reset_gpio
  * Fabio: Invert reset_gpio due to GPIO_ACTIVE_HIGH -> GPIO_ACTIVE_LOW change
  * Fabio: Remove empty line
  * Fabio: Remove real error from devm_gpiod_get() failures
  * Sakari: ARRAY_SIZE() directly instead of through OV8856_NUM_SUPPLIES
  * Sakari: Use XVCLK rate as provided by DT

 drivers/media/i2c/ov8856.c | 138 +++++++++++++++++++++++++++++++++----
 1 file changed, 124 insertions(+), 14 deletions(-)

diff --git a/drivers/media/i2c/ov8856.c b/drivers/media/i2c/ov8856.c
index 8655842af275..68cf2d6c5804 100644
--- a/drivers/media/i2c/ov8856.c
+++ b/drivers/media/i2c/ov8856.c
@@ -3,10 +3,13 @@
 
 #include <asm/unaligned.h>
 #include <linux/acpi.h>
+#include <linux/clk.h>
 #include <linux/delay.h>
+#include <linux/gpio/consumer.h>
 #include <linux/i2c.h>
 #include <linux/module.h>
 #include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
 #include <media/v4l2-ctrls.h>
 #include <media/v4l2-device.h>
 #include <media/v4l2-fwnode.h>
@@ -18,7 +21,7 @@
 #define OV8856_LINK_FREQ_360MHZ		360000000ULL
 #define OV8856_LINK_FREQ_180MHZ		180000000ULL
 #define OV8856_SCLK			144000000ULL
-#define OV8856_MCLK			19200000
+#define OV8856_XVCLK_19_2		19200000
 #define OV8856_DATA_LANES		4
 #define OV8856_RGB_DEPTH		10
 
@@ -64,6 +67,12 @@
 
 #define to_ov8856(_sd)			container_of(_sd, struct ov8856, sd)
 
+static const char * const ov8856_supply_names[] = {
+	"dovdd",	/* Digital I/O power */
+	"avdd",		/* Analog power */
+	"dvdd",		/* Digital core power */
+};
+
 enum {
 	OV8856_LINK_FREQ_720MBPS,
 	OV8856_LINK_FREQ_360MBPS,
@@ -566,6 +575,10 @@ struct ov8856 {
 	struct media_pad pad;
 	struct v4l2_ctrl_handler ctrl_handler;
 
+	struct clk		*xvclk;
+	struct gpio_desc	*reset_gpio;
+	struct regulator_bulk_data supplies[ARRAY_SIZE(ov8856_supply_names)];
+
 	/* V4L2 Controls */
 	struct v4l2_ctrl *link_freq;
 	struct v4l2_ctrl *pixel_rate;
@@ -908,6 +921,57 @@ static int ov8856_set_stream(struct v4l2_subdev *sd, int enable)
 	return ret;
 }
 
+static int __ov8856_power_on(struct ov8856 *ov8856)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&ov8856->sd);
+	int ret;
+
+	if (is_acpi_node(dev_fwnode(&client->dev)))
+		return 0;
+
+	ret = clk_prepare_enable(ov8856->xvclk);
+	if (ret < 0) {
+		dev_err(&client->dev, "failed to enable xvclk\n");
+		return ret;
+	}
+
+	if (ov8856->reset_gpio) {
+		gpiod_set_value_cansleep(ov8856->reset_gpio, 1);
+		usleep_range(1000, 2000);
+	}
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(ov8856_supply_names),
+				    ov8856->supplies);
+	if (ret < 0) {
+		dev_err(&client->dev, "failed to enable regulators\n");
+		goto disable_clk;
+	}
+
+	gpiod_set_value_cansleep(ov8856->reset_gpio, 0);
+	usleep_range(1500, 1800);
+
+	return 0;
+
+disable_clk:
+	gpiod_set_value_cansleep(ov8856->reset_gpio, 1);
+	clk_disable_unprepare(ov8856->xvclk);
+
+	return ret;
+}
+
+static void __ov8856_power_off(struct ov8856 *ov8856)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&ov8856->sd);
+
+	if (is_acpi_node(dev_fwnode(&client->dev)))
+		return;
+
+	gpiod_set_value_cansleep(ov8856->reset_gpio, 1);
+	regulator_bulk_disable(ARRAY_SIZE(ov8856_supply_names),
+			       ov8856->supplies);
+	clk_disable_unprepare(ov8856->xvclk);
+}
+
 static int __maybe_unused ov8856_suspend(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
@@ -918,6 +982,7 @@ static int __maybe_unused ov8856_suspend(struct device *dev)
 	if (ov8856->streaming)
 		ov8856_stop_streaming(ov8856);
 
+	__ov8856_power_off(ov8856);
 	mutex_unlock(&ov8856->mutex);
 
 	return 0;
@@ -931,6 +996,8 @@ static int __maybe_unused ov8856_resume(struct device *dev)
 	int ret;
 
 	mutex_lock(&ov8856->mutex);
+
+	__ov8856_power_on(ov8856);
 	if (ov8856->streaming) {
 		ret = ov8856_start_streaming(ov8856);
 		if (ret) {
@@ -1092,29 +1159,53 @@ static int ov8856_identify_module(struct ov8856 *ov8856)
 	return 0;
 }
 
-static int ov8856_check_hwcfg(struct device *dev)
+static int ov8856_get_hwcfg(struct ov8856 *ov8856, struct device *dev)
 {
 	struct fwnode_handle *ep;
 	struct fwnode_handle *fwnode = dev_fwnode(dev);
 	struct v4l2_fwnode_endpoint bus_cfg = {
 		.bus_type = V4L2_MBUS_CSI2_DPHY
 	};
-	u32 mclk;
+	u32 xvclk_rate;
 	int ret;
 	unsigned int i, j;
 
 	if (!fwnode)
 		return -ENXIO;
 
-	ret = fwnode_property_read_u32(fwnode, "clock-frequency", &mclk);
+	ret = fwnode_property_read_u32(fwnode, "clock-frequency",
+		&xvclk_rate);
 	if (ret)
 		return ret;
 
-	if (mclk != OV8856_MCLK) {
-		dev_err(dev, "external clock %d is not supported", mclk);
-		return -EINVAL;
+	if (!is_acpi_node(fwnode)) {
+		ov8856->xvclk = devm_clk_get(dev, "xvclk");
+		if (IS_ERR(ov8856->xvclk)) {
+			dev_err(dev, "could not get xvclk clock (%pe)\n",
+				ov8856->xvclk);
+			return PTR_ERR(ov8856->xvclk);
+		}
+
+		clk_set_rate(ov8856->xvclk, xvclk_rate);
+		xvclk_rate = clk_get_rate(ov8856->xvclk);
 	}
 
+	if (xvclk_rate != OV8856_XVCLK_19_2)
+		dev_warn(dev, "external clock rate %d is unsupported", xvclk_rate);
+
+	ov8856->reset_gpio = devm_gpiod_get_optional(dev, "reset",
+		GPIOD_OUT_LOW);
+	if (IS_ERR(ov8856->reset_gpio))
+		return PTR_ERR(ov8856->reset_gpio);
+
+	for (i = 0; i < ARRAY_SIZE(ov8856_supply_names); i++)
+		ov8856->supplies[i].supply = ov8856_supply_names[i];
+
+	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ov8856_supply_names),
+				      ov8856->supplies);
+	if (ret)
+		return ret;
+
 	ep = fwnode_graph_get_next_endpoint(fwnode, NULL);
 	if (!ep)
 		return -ENXIO;
@@ -1169,6 +1260,8 @@ static int ov8856_remove(struct i2c_client *client)
 	pm_runtime_disable(&client->dev);
 	mutex_destroy(&ov8856->mutex);
 
+	__ov8856_power_off(ov8856);
+
 	return 0;
 }
 
@@ -1177,22 +1270,29 @@ static int ov8856_probe(struct i2c_client *client)
 	struct ov8856 *ov8856;
 	int ret;
 
-	ret = ov8856_check_hwcfg(&client->dev);
+	ov8856 = devm_kzalloc(&client->dev, sizeof(*ov8856), GFP_KERNEL);
+	if (!ov8856)
+		return -ENOMEM;
+
+	ret = ov8856_get_hwcfg(ov8856, &client->dev);
 	if (ret) {
-		dev_err(&client->dev, "failed to check HW configuration: %d",
+		dev_err(&client->dev, "failed to get HW configuration: %d",
 			ret);
 		return ret;
 	}
 
-	ov8856 = devm_kzalloc(&client->dev, sizeof(*ov8856), GFP_KERNEL);
-	if (!ov8856)
-		return -ENOMEM;
-
 	v4l2_i2c_subdev_init(&ov8856->sd, client, &ov8856_subdev_ops);
+
+	ret = __ov8856_power_on(ov8856);
+	if (ret) {
+		dev_err(&client->dev, "failed to power on\n");
+		return ret;
+	}
+
 	ret = ov8856_identify_module(ov8856);
 	if (ret) {
 		dev_err(&client->dev, "failed to find sensor: %d", ret);
-		return ret;
+		goto probe_power_off;
 	}
 
 	mutex_init(&ov8856->mutex);
@@ -1238,6 +1338,9 @@ static int ov8856_probe(struct i2c_client *client)
 	v4l2_ctrl_handler_free(ov8856->sd.ctrl_handler);
 	mutex_destroy(&ov8856->mutex);
 
+probe_power_off:
+	__ov8856_power_off(ov8856);
+
 	return ret;
 }
 
@@ -1254,11 +1357,18 @@ static const struct acpi_device_id ov8856_acpi_ids[] = {
 MODULE_DEVICE_TABLE(acpi, ov8856_acpi_ids);
 #endif
 
+static const struct of_device_id ov8856_of_match[] = {
+	{ .compatible = "ovti,ov8856" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ov8856_of_match);
+
 static struct i2c_driver ov8856_i2c_driver = {
 	.driver = {
 		.name = "ov8856",
 		.pm = &ov8856_pm_ops,
 		.acpi_match_table = ACPI_PTR(ov8856_acpi_ids),
+		.of_match_table = ov8856_of_match,
 	},
 	.probe_new = ov8856_probe,
 	.remove = ov8856_remove,
-- 
2.25.1


^ permalink raw reply related	[flat|nested] 12+ messages in thread
* [PATCH v8 2/3] media: ov8856: Add devicetree support
@ 2020-05-11 11:03   ` Robert Foss
  0 siblings, 0 replies; 12+ messages in thread
From: Robert Foss @ 2020-05-11 11:03 UTC (permalink / raw)
  To: Andy Shevchenko, Sakari Ailus, Marco Felsch, Maxime Ripard,
	linux-media, devicetree, linux-kernel, linux-arm-kernel
  Cc: Ben Kao, Fabio Estevam, Dongchun Zhu, Robert Foss, Tomasz Figa

Add match table, enable ov8856_probe() to support
both ACPI and DT modes.

ACPI and DT modes are primarily distinguished from
by checking for ACPI mode and by having resource like
be NULL.

Signed-off-by: Robert Foss <robert.foss@linaro.org>
---

- Changes since v7:
  * Marco: Align split line
  * Marco: Early escape during __ov8856_power_off for ACPI mode
  * Marco: Remove dev ptr from struct ov8856

- Changes since v6:
  * Marco: Bail out of __ov8856_power_on earlier if ACPI mode

- Changes since v5:
  * Maxime & Sakari: Replaced clock tolerance check with warning

- Changes since v4:
  * Maxime & Sakari: Switch to clock-frequency

- Changes since v3:
  * Remove redundant {}-brackets
  * Compare xvclk_rate to 5% tolerance
  * Andy: Use dev_fwnode()
  * Andy: Use %pe instead of %ld + PTR_ERR()
  * Andy: Invert reset_gpio logic
  * Andy: Remove dev_dbg() from failing reset_gpio setup
  * Andy: Use dev_err for logging for failures
  * Andy: Remove dev_warn from EDEFER/regulator error path
  * Andy & Sakari: Replaced GPIOD_OUT_XXX with 0/1
  * Maxime & Sakari: Verify clock frequency from DT
  * Sakari: Verify the 'xvclk_rate' is set correctly for ACPI/DT devices
  * Sakari: Remove duplicate ov8856->dev assignment

- Changes since v2:
  * Added "struct device *dev" member to struct ov8856
  * Andy: Switch to optional version of devm_gpiod_get
  * Andy: Switch to optional version of devm_clk_get
  * Fabio: Add reset sleep period
  * Sakari: Unify defines for 19.2Mhz
  * Sakari: Remove 24Mhz clock, since it isn't needed for supported modes
  * Sakari: Replace dev_info() with dev_dbg()
  * Sakari: Switch induction variable type to unsigned
  * Sakari: Don't wait for reset_gpio when in ACPI mode
  * Sakari: Pull reset GPIO high on power on failure
  * Sakari: Add power on/off to resume/suspend
  * Sakari: Fix indentation
  * Sakari: Power off during ov8856_remove()
  * Sakari: Don't sleep during power-on in ACPI mode
  * Sakari: Switch to getting xvclk from clk_get_rate

- Changes since v1:
  * Andy & Sakari: Make XVCLK optional since to not break ACPI
  * Fabio: Change n_shutdown_gpio name to reset_gpio
  * Fabio: Invert reset_gpio due to GPIO_ACTIVE_HIGH -> GPIO_ACTIVE_LOW change
  * Fabio: Remove empty line
  * Fabio: Remove real error from devm_gpiod_get() failures
  * Sakari: ARRAY_SIZE() directly instead of through OV8856_NUM_SUPPLIES
  * Sakari: Use XVCLK rate as provided by DT

 drivers/media/i2c/ov8856.c | 138 +++++++++++++++++++++++++++++++++----
 1 file changed, 124 insertions(+), 14 deletions(-)

diff --git a/drivers/media/i2c/ov8856.c b/drivers/media/i2c/ov8856.c
index 8655842af275..68cf2d6c5804 100644
--- a/drivers/media/i2c/ov8856.c
+++ b/drivers/media/i2c/ov8856.c
@@ -3,10 +3,13 @@
 
 #include <asm/unaligned.h>
 #include <linux/acpi.h>
+#include <linux/clk.h>
 #include <linux/delay.h>
+#include <linux/gpio/consumer.h>
 #include <linux/i2c.h>
 #include <linux/module.h>
 #include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
 #include <media/v4l2-ctrls.h>
 #include <media/v4l2-device.h>
 #include <media/v4l2-fwnode.h>
@@ -18,7 +21,7 @@
 #define OV8856_LINK_FREQ_360MHZ		360000000ULL
 #define OV8856_LINK_FREQ_180MHZ		180000000ULL
 #define OV8856_SCLK			144000000ULL
-#define OV8856_MCLK			19200000
+#define OV8856_XVCLK_19_2		19200000
 #define OV8856_DATA_LANES		4
 #define OV8856_RGB_DEPTH		10
 
@@ -64,6 +67,12 @@
 
 #define to_ov8856(_sd)			container_of(_sd, struct ov8856, sd)
 
+static const char * const ov8856_supply_names[] = {
+	"dovdd",	/* Digital I/O power */
+	"avdd",		/* Analog power */
+	"dvdd",		/* Digital core power */
+};
+
 enum {
 	OV8856_LINK_FREQ_720MBPS,
 	OV8856_LINK_FREQ_360MBPS,
@@ -566,6 +575,10 @@ struct ov8856 {
 	struct media_pad pad;
 	struct v4l2_ctrl_handler ctrl_handler;
 
+	struct clk		*xvclk;
+	struct gpio_desc	*reset_gpio;
+	struct regulator_bulk_data supplies[ARRAY_SIZE(ov8856_supply_names)];
+
 	/* V4L2 Controls */
 	struct v4l2_ctrl *link_freq;
 	struct v4l2_ctrl *pixel_rate;
@@ -908,6 +921,57 @@ static int ov8856_set_stream(struct v4l2_subdev *sd, int enable)
 	return ret;
 }
 
+static int __ov8856_power_on(struct ov8856 *ov8856)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&ov8856->sd);
+	int ret;
+
+	if (is_acpi_node(dev_fwnode(&client->dev)))
+		return 0;
+
+	ret = clk_prepare_enable(ov8856->xvclk);
+	if (ret < 0) {
+		dev_err(&client->dev, "failed to enable xvclk\n");
+		return ret;
+	}
+
+	if (ov8856->reset_gpio) {
+		gpiod_set_value_cansleep(ov8856->reset_gpio, 1);
+		usleep_range(1000, 2000);
+	}
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(ov8856_supply_names),
+				    ov8856->supplies);
+	if (ret < 0) {
+		dev_err(&client->dev, "failed to enable regulators\n");
+		goto disable_clk;
+	}
+
+	gpiod_set_value_cansleep(ov8856->reset_gpio, 0);
+	usleep_range(1500, 1800);
+
+	return 0;
+
+disable_clk:
+	gpiod_set_value_cansleep(ov8856->reset_gpio, 1);
+	clk_disable_unprepare(ov8856->xvclk);
+
+	return ret;
+}
+
+static void __ov8856_power_off(struct ov8856 *ov8856)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&ov8856->sd);
+
+	if (is_acpi_node(dev_fwnode(&client->dev)))
+		return;
+
+	gpiod_set_value_cansleep(ov8856->reset_gpio, 1);
+	regulator_bulk_disable(ARRAY_SIZE(ov8856_supply_names),
+			       ov8856->supplies);
+	clk_disable_unprepare(ov8856->xvclk);
+}
+
 static int __maybe_unused ov8856_suspend(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
@@ -918,6 +982,7 @@ static int __maybe_unused ov8856_suspend(struct device *dev)
 	if (ov8856->streaming)
 		ov8856_stop_streaming(ov8856);
 
+	__ov8856_power_off(ov8856);
 	mutex_unlock(&ov8856->mutex);
 
 	return 0;
@@ -931,6 +996,8 @@ static int __maybe_unused ov8856_resume(struct device *dev)
 	int ret;
 
 	mutex_lock(&ov8856->mutex);
+
+	__ov8856_power_on(ov8856);
 	if (ov8856->streaming) {
 		ret = ov8856_start_streaming(ov8856);
 		if (ret) {
@@ -1092,29 +1159,53 @@ static int ov8856_identify_module(struct ov8856 *ov8856)
 	return 0;
 }
 
-static int ov8856_check_hwcfg(struct device *dev)
+static int ov8856_get_hwcfg(struct ov8856 *ov8856, struct device *dev)
 {
 	struct fwnode_handle *ep;
 	struct fwnode_handle *fwnode = dev_fwnode(dev);
 	struct v4l2_fwnode_endpoint bus_cfg = {
 		.bus_type = V4L2_MBUS_CSI2_DPHY
 	};
-	u32 mclk;
+	u32 xvclk_rate;
 	int ret;
 	unsigned int i, j;
 
 	if (!fwnode)
 		return -ENXIO;
 
-	ret = fwnode_property_read_u32(fwnode, "clock-frequency", &mclk);
+	ret = fwnode_property_read_u32(fwnode, "clock-frequency",
+		&xvclk_rate);
 	if (ret)
 		return ret;
 
-	if (mclk != OV8856_MCLK) {
-		dev_err(dev, "external clock %d is not supported", mclk);
-		return -EINVAL;
+	if (!is_acpi_node(fwnode)) {
+		ov8856->xvclk = devm_clk_get(dev, "xvclk");
+		if (IS_ERR(ov8856->xvclk)) {
+			dev_err(dev, "could not get xvclk clock (%pe)\n",
+				ov8856->xvclk);
+			return PTR_ERR(ov8856->xvclk);
+		}
+
+		clk_set_rate(ov8856->xvclk, xvclk_rate);
+		xvclk_rate = clk_get_rate(ov8856->xvclk);
 	}
 
+	if (xvclk_rate != OV8856_XVCLK_19_2)
+		dev_warn(dev, "external clock rate %d is unsupported", xvclk_rate);
+
+	ov8856->reset_gpio = devm_gpiod_get_optional(dev, "reset",
+		GPIOD_OUT_LOW);
+	if (IS_ERR(ov8856->reset_gpio))
+		return PTR_ERR(ov8856->reset_gpio);
+
+	for (i = 0; i < ARRAY_SIZE(ov8856_supply_names); i++)
+		ov8856->supplies[i].supply = ov8856_supply_names[i];
+
+	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ov8856_supply_names),
+				      ov8856->supplies);
+	if (ret)
+		return ret;
+
 	ep = fwnode_graph_get_next_endpoint(fwnode, NULL);
 	if (!ep)
 		return -ENXIO;
@@ -1169,6 +1260,8 @@ static int ov8856_remove(struct i2c_client *client)
 	pm_runtime_disable(&client->dev);
 	mutex_destroy(&ov8856->mutex);
 
+	__ov8856_power_off(ov8856);
+
 	return 0;
 }
 
@@ -1177,22 +1270,29 @@ static int ov8856_probe(struct i2c_client *client)
 	struct ov8856 *ov8856;
 	int ret;
 
-	ret = ov8856_check_hwcfg(&client->dev);
+	ov8856 = devm_kzalloc(&client->dev, sizeof(*ov8856), GFP_KERNEL);
+	if (!ov8856)
+		return -ENOMEM;
+
+	ret = ov8856_get_hwcfg(ov8856, &client->dev);
 	if (ret) {
-		dev_err(&client->dev, "failed to check HW configuration: %d",
+		dev_err(&client->dev, "failed to get HW configuration: %d",
 			ret);
 		return ret;
 	}
 
-	ov8856 = devm_kzalloc(&client->dev, sizeof(*ov8856), GFP_KERNEL);
-	if (!ov8856)
-		return -ENOMEM;
-
 	v4l2_i2c_subdev_init(&ov8856->sd, client, &ov8856_subdev_ops);
+
+	ret = __ov8856_power_on(ov8856);
+	if (ret) {
+		dev_err(&client->dev, "failed to power on\n");
+		return ret;
+	}
+
 	ret = ov8856_identify_module(ov8856);
 	if (ret) {
 		dev_err(&client->dev, "failed to find sensor: %d", ret);
-		return ret;
+		goto probe_power_off;
 	}
 
 	mutex_init(&ov8856->mutex);
@@ -1238,6 +1338,9 @@ static int ov8856_probe(struct i2c_client *client)
 	v4l2_ctrl_handler_free(ov8856->sd.ctrl_handler);
 	mutex_destroy(&ov8856->mutex);
 
+probe_power_off:
+	__ov8856_power_off(ov8856);
+
 	return ret;
 }
 
@@ -1254,11 +1357,18 @@ static const struct acpi_device_id ov8856_acpi_ids[] = {
 MODULE_DEVICE_TABLE(acpi, ov8856_acpi_ids);
 #endif
 
+static const struct of_device_id ov8856_of_match[] = {
+	{ .compatible = "ovti,ov8856" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ov8856_of_match);
+
 static struct i2c_driver ov8856_i2c_driver = {
 	.driver = {
 		.name = "ov8856",
 		.pm = &ov8856_pm_ops,
 		.acpi_match_table = ACPI_PTR(ov8856_acpi_ids),
+		.of_match_table = ov8856_of_match,
 	},
 	.probe_new = ov8856_probe,
 	.remove = ov8856_remove,
-- 
2.25.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply related	[flat|nested] 12+ messages in thread
* [PATCH v8 3/3] media: ov8856: Implement sensor module revision identification
  2020-05-11 11:03 ` Robert Foss
@ 2020-05-11 11:03   ` Robert Foss
  -1 siblings, 0 replies; 12+ messages in thread
From: Robert Foss @ 2020-05-11 11:03 UTC (permalink / raw)
  To: Andy Shevchenko, Sakari Ailus, Marco Felsch, Maxime Ripard,
	linux-media, devicetree, linux-kernel, linux-arm-kernel
  Cc: Dongchun Zhu, Fabio Estevam, Tomasz Figa, Ben Kao, Robert Foss

Query the sensor for its module revision, and compare it
to known revisions.

Currently 2A and 1B revision indentification is supported.

Signed-off-by: Robert Foss <robert.foss@linaro.org>
---

- Changes since v7:
  * Marco: Align broken line

- Changes since v3:
  * Actually add module revision 2A

- Changes since v2:
  * Add module revision 2A
  * Sakari: Remove ov8856_check_revision()
  * Sakari: Stop EEPROM streaming mode

 drivers/media/i2c/ov8856.c | 53 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/drivers/media/i2c/ov8856.c b/drivers/media/i2c/ov8856.c
index 68cf2d6c5804..1657e03d9a9d 100644
--- a/drivers/media/i2c/ov8856.c
+++ b/drivers/media/i2c/ov8856.c
@@ -32,6 +32,19 @@
 #define OV8856_MODE_STANDBY		0x00
 #define OV8856_MODE_STREAMING		0x01
 
+/* module revisions */
+#define OV8856_2A_MODULE		0x01
+#define OV8856_1B_MODULE		0x02
+
+/* the OTP read-out buffer is at 0x7000 and 0xf is the offset
+ * of the byte in the OTP that means the module revision
+ */
+#define OV8856_MODULE_REVISION		0x700f
+#define OV8856_OTP_MODE_CTRL		0x3d84
+#define OV8856_OTP_LOAD_CTRL		0x3d81
+#define OV8856_OTP_MODE_AUTO		0x00
+#define OV8856_OTP_LOAD_CTRL_ENABLE	BIT(0)
+
 /* vertical-timings from sensor */
 #define OV8856_REG_VTS			0x380e
 #define OV8856_VTS_MAX			0x7fff
@@ -1156,6 +1169,46 @@ static int ov8856_identify_module(struct ov8856 *ov8856)
 		return -ENXIO;
 	}
 
+	ret = ov8856_write_reg(ov8856, OV8856_REG_MODE_SELECT,
+			       OV8856_REG_VALUE_08BIT, OV8856_MODE_STREAMING);
+	if (ret)
+		return ret;
+
+	ret = ov8856_write_reg(ov8856, OV8856_OTP_MODE_CTRL,
+			       OV8856_REG_VALUE_08BIT, OV8856_OTP_MODE_AUTO);
+	if (ret) {
+		dev_err(&client->dev, "failed to set otp mode");
+		return ret;
+	}
+
+	ret = ov8856_write_reg(ov8856, OV8856_OTP_LOAD_CTRL,
+			       OV8856_REG_VALUE_08BIT,
+			       OV8856_OTP_LOAD_CTRL_ENABLE);
+	if (ret) {
+		dev_err(&client->dev, "failed to enable load control");
+		return ret;
+	}
+
+	ret = ov8856_read_reg(ov8856, OV8856_MODULE_REVISION,
+			      OV8856_REG_VALUE_08BIT, &val);
+	if (ret) {
+		dev_err(&client->dev, "failed to read module revision");
+		return ret;
+	}
+
+	dev_info(&client->dev, "OV8856 revision %x (%s) at address 0x%02x\n",
+		 val,
+		 val == OV8856_2A_MODULE ? "2A" :
+		 val == OV8856_1B_MODULE ? "1B" : "unknown revision",
+		 client->addr);
+
+	ret = ov8856_write_reg(ov8856, OV8856_REG_MODE_SELECT,
+			       OV8856_REG_VALUE_08BIT, OV8856_MODE_STANDBY);
+	if (ret) {
+		dev_err(&client->dev, "failed to exit streaming mode");
+		return ret;
+	}
+
 	return 0;
 }
 
-- 
2.25.1


^ permalink raw reply related	[flat|nested] 12+ messages in thread
* [PATCH v8 3/3] media: ov8856: Implement sensor module revision identification
@ 2020-05-11 11:03   ` Robert Foss
  0 siblings, 0 replies; 12+ messages in thread
From: Robert Foss @ 2020-05-11 11:03 UTC (permalink / raw)
  To: Andy Shevchenko, Sakari Ailus, Marco Felsch, Maxime Ripard,
	linux-media, devicetree, linux-kernel, linux-arm-kernel
  Cc: Ben Kao, Fabio Estevam, Dongchun Zhu, Robert Foss, Tomasz Figa

Query the sensor for its module revision, and compare it
to known revisions.

Currently 2A and 1B revision indentification is supported.

Signed-off-by: Robert Foss <robert.foss@linaro.org>
---

- Changes since v7:
  * Marco: Align broken line

- Changes since v3:
  * Actually add module revision 2A

- Changes since v2:
  * Add module revision 2A
  * Sakari: Remove ov8856_check_revision()
  * Sakari: Stop EEPROM streaming mode

 drivers/media/i2c/ov8856.c | 53 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/drivers/media/i2c/ov8856.c b/drivers/media/i2c/ov8856.c
index 68cf2d6c5804..1657e03d9a9d 100644
--- a/drivers/media/i2c/ov8856.c
+++ b/drivers/media/i2c/ov8856.c
@@ -32,6 +32,19 @@
 #define OV8856_MODE_STANDBY		0x00
 #define OV8856_MODE_STREAMING		0x01
 
+/* module revisions */
+#define OV8856_2A_MODULE		0x01
+#define OV8856_1B_MODULE		0x02
+
+/* the OTP read-out buffer is at 0x7000 and 0xf is the offset
+ * of the byte in the OTP that means the module revision
+ */
+#define OV8856_MODULE_REVISION		0x700f
+#define OV8856_OTP_MODE_CTRL		0x3d84
+#define OV8856_OTP_LOAD_CTRL		0x3d81
+#define OV8856_OTP_MODE_AUTO		0x00
+#define OV8856_OTP_LOAD_CTRL_ENABLE	BIT(0)
+
 /* vertical-timings from sensor */
 #define OV8856_REG_VTS			0x380e
 #define OV8856_VTS_MAX			0x7fff
@@ -1156,6 +1169,46 @@ static int ov8856_identify_module(struct ov8856 *ov8856)
 		return -ENXIO;
 	}
 
+	ret = ov8856_write_reg(ov8856, OV8856_REG_MODE_SELECT,
+			       OV8856_REG_VALUE_08BIT, OV8856_MODE_STREAMING);
+	if (ret)
+		return ret;
+
+	ret = ov8856_write_reg(ov8856, OV8856_OTP_MODE_CTRL,
+			       OV8856_REG_VALUE_08BIT, OV8856_OTP_MODE_AUTO);
+	if (ret) {
+		dev_err(&client->dev, "failed to set otp mode");
+		return ret;
+	}
+
+	ret = ov8856_write_reg(ov8856, OV8856_OTP_LOAD_CTRL,
+			       OV8856_REG_VALUE_08BIT,
+			       OV8856_OTP_LOAD_CTRL_ENABLE);
+	if (ret) {
+		dev_err(&client->dev, "failed to enable load control");
+		return ret;
+	}
+
+	ret = ov8856_read_reg(ov8856, OV8856_MODULE_REVISION,
+			      OV8856_REG_VALUE_08BIT, &val);
+	if (ret) {
+		dev_err(&client->dev, "failed to read module revision");
+		return ret;
+	}
+
+	dev_info(&client->dev, "OV8856 revision %x (%s) at address 0x%02x\n",
+		 val,
+		 val == OV8856_2A_MODULE ? "2A" :
+		 val == OV8856_1B_MODULE ? "1B" : "unknown revision",
+		 client->addr);
+
+	ret = ov8856_write_reg(ov8856, OV8856_REG_MODE_SELECT,
+			       OV8856_REG_VALUE_08BIT, OV8856_MODE_STANDBY);
+	if (ret) {
+		dev_err(&client->dev, "failed to exit streaming mode");
+		return ret;
+	}
+
 	return 0;
 }
 
-- 
2.25.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply related	[flat|nested] 12+ messages in thread
* Re: [PATCH v8 2/3] media: ov8856: Add devicetree support
  2020-05-11 11:03   ` Robert Foss
@ 2020-05-12  0:25     ` Sakari Ailus
  -1 siblings, 0 replies; 12+ messages in thread
From: Sakari Ailus @ 2020-05-12  0:25 UTC (permalink / raw)
  To: Robert Foss
  Cc: Andy Shevchenko, Marco Felsch, Maxime Ripard, linux-media,
	devicetree, linux-kernel, linux-arm-kernel, Dongchun Zhu,
	Fabio Estevam, Tomasz Figa, Ben Kao

Hi Robert,

On Mon, May 11, 2020 at 01:03:49PM +0200, Robert Foss wrote:
> Add match table, enable ov8856_probe() to support
> both ACPI and DT modes.
> 
> ACPI and DT modes are primarily distinguished from
> by checking for ACPI mode and by having resource like
> be NULL.
> 
> Signed-off-by: Robert Foss <robert.foss@linaro.org>

Applied with this small diff --- please check with checkpatch.pl on the
next time. Thanks!

diff --git a/drivers/media/i2c/ov8856.c b/drivers/media/i2c/ov8856.c
index 1657e03d9a9d..4ca27675cc5a 100644
--- a/drivers/media/i2c/ov8856.c
+++ b/drivers/media/i2c/ov8856.c
@@ -1226,8 +1226,7 @@ static int ov8856_get_hwcfg(struct ov8856 *ov8856, struct device *dev)
 	if (!fwnode)
 		return -ENXIO;
 
-	ret = fwnode_property_read_u32(fwnode, "clock-frequency",
-		&xvclk_rate);
+	ret = fwnode_property_read_u32(fwnode, "clock-frequency", &xvclk_rate);
 	if (ret)
 		return ret;
 
@@ -1244,10 +1243,11 @@ static int ov8856_get_hwcfg(struct ov8856 *ov8856, struct device *dev)
 	}
 
 	if (xvclk_rate != OV8856_XVCLK_19_2)
-		dev_warn(dev, "external clock rate %d is unsupported", xvclk_rate);
+		dev_warn(dev, "external clock rate %u is unsupported",
+			 xvclk_rate);
 
 	ov8856->reset_gpio = devm_gpiod_get_optional(dev, "reset",
-		GPIOD_OUT_LOW);
+						     GPIOD_OUT_LOW);
 	if (IS_ERR(ov8856->reset_gpio))
 		return PTR_ERR(ov8856->reset_gpio);
 
-- 
Kind regards,

Sakari Ailus

^ permalink raw reply related	[flat|nested] 12+ messages in thread
* Re: [PATCH v8 2/3] media: ov8856: Add devicetree support
@ 2020-05-12  0:25     ` Sakari Ailus
  0 siblings, 0 replies; 12+ messages in thread
From: Sakari Ailus @ 2020-05-12  0:25 UTC (permalink / raw)
  To: Robert Foss
  Cc: devicetree, Tomasz Figa, Dongchun Zhu, Marco Felsch,
	linux-kernel, Ben Kao, Maxime Ripard, Andy Shevchenko,
	Fabio Estevam, linux-arm-kernel, linux-media

Hi Robert,

On Mon, May 11, 2020 at 01:03:49PM +0200, Robert Foss wrote:
> Add match table, enable ov8856_probe() to support
> both ACPI and DT modes.
> 
> ACPI and DT modes are primarily distinguished from
> by checking for ACPI mode and by having resource like
> be NULL.
> 
> Signed-off-by: Robert Foss <robert.foss@linaro.org>

Applied with this small diff --- please check with checkpatch.pl on the
next time. Thanks!

diff --git a/drivers/media/i2c/ov8856.c b/drivers/media/i2c/ov8856.c
index 1657e03d9a9d..4ca27675cc5a 100644
--- a/drivers/media/i2c/ov8856.c
+++ b/drivers/media/i2c/ov8856.c
@@ -1226,8 +1226,7 @@ static int ov8856_get_hwcfg(struct ov8856 *ov8856, struct device *dev)
 	if (!fwnode)
 		return -ENXIO;
 
-	ret = fwnode_property_read_u32(fwnode, "clock-frequency",
-		&xvclk_rate);
+	ret = fwnode_property_read_u32(fwnode, "clock-frequency", &xvclk_rate);
 	if (ret)
 		return ret;
 
@@ -1244,10 +1243,11 @@ static int ov8856_get_hwcfg(struct ov8856 *ov8856, struct device *dev)
 	}
 
 	if (xvclk_rate != OV8856_XVCLK_19_2)
-		dev_warn(dev, "external clock rate %d is unsupported", xvclk_rate);
+		dev_warn(dev, "external clock rate %u is unsupported",
+			 xvclk_rate);
 
 	ov8856->reset_gpio = devm_gpiod_get_optional(dev, "reset",
-		GPIOD_OUT_LOW);
+						     GPIOD_OUT_LOW);
 	if (IS_ERR(ov8856->reset_gpio))
 		return PTR_ERR(ov8856->reset_gpio);
 
-- 
Kind regards,

Sakari Ailus

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply related	[flat|nested] 12+ messages in thread
* Re: [PATCH v8 2/3] media: ov8856: Add devicetree support
  2020-05-12  0:25     ` Sakari Ailus
@ 2020-05-12  8:13       ` Robert Foss
  -1 siblings, 0 replies; 12+ messages in thread
From: Robert Foss @ 2020-05-12  8:13 UTC (permalink / raw)
  To: Sakari Ailus
  Cc: Andy Shevchenko, Marco Felsch, Maxime Ripard, linux-media,
	open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS,
	linux-kernel,
	moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE,
	Dongchun Zhu, Fabio Estevam, Tomasz Figa, Ben Kao

On Tue, 12 May 2020 at 02:26, Sakari Ailus <sakari.ailus@iki.fi> wrote:
>
> Hi Robert,
>
> On Mon, May 11, 2020 at 01:03:49PM +0200, Robert Foss wrote:
> > Add match table, enable ov8856_probe() to support
> > both ACPI and DT modes.
> >
> > ACPI and DT modes are primarily distinguished from
> > by checking for ACPI mode and by having resource like
> > be NULL.
> >
> > Signed-off-by: Robert Foss <robert.foss@linaro.org>
>
> Applied with this small diff --- please check with checkpatch.pl on the
> next time. Thanks!

Thanks Sakari, I appreciate it!

>
> diff --git a/drivers/media/i2c/ov8856.c b/drivers/media/i2c/ov8856.c
> index 1657e03d9a9d..4ca27675cc5a 100644
> --- a/drivers/media/i2c/ov8856.c
> +++ b/drivers/media/i2c/ov8856.c
> @@ -1226,8 +1226,7 @@ static int ov8856_get_hwcfg(struct ov8856 *ov8856, struct device *dev)
>         if (!fwnode)
>                 return -ENXIO;
>
> -       ret = fwnode_property_read_u32(fwnode, "clock-frequency",
> -               &xvclk_rate);
> +       ret = fwnode_property_read_u32(fwnode, "clock-frequency", &xvclk_rate);
>         if (ret)
>                 return ret;
>
> @@ -1244,10 +1243,11 @@ static int ov8856_get_hwcfg(struct ov8856 *ov8856, struct device *dev)
>         }
>
>         if (xvclk_rate != OV8856_XVCLK_19_2)
> -               dev_warn(dev, "external clock rate %d is unsupported", xvclk_rate);
> +               dev_warn(dev, "external clock rate %u is unsupported",
> +                        xvclk_rate);
>
>         ov8856->reset_gpio = devm_gpiod_get_optional(dev, "reset",
> -               GPIOD_OUT_LOW);
> +                                                    GPIOD_OUT_LOW);
>         if (IS_ERR(ov8856->reset_gpio))
>                 return PTR_ERR(ov8856->reset_gpio);
>
> --
> Kind regards,
>
> Sakari Ailus

^ permalink raw reply	[flat|nested] 12+ messages in thread
* Re: [PATCH v8 2/3] media: ov8856: Add devicetree support
@ 2020-05-12  8:13       ` Robert Foss
  0 siblings, 0 replies; 12+ messages in thread
From: Robert Foss @ 2020-05-12  8:13 UTC (permalink / raw)
  To: Sakari Ailus
  Cc: open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS,
	Tomasz Figa, Dongchun Zhu, Marco Felsch, linux-kernel, Ben Kao,
	Maxime Ripard, Andy Shevchenko, Fabio Estevam,
	moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE,
	linux-media

On Tue, 12 May 2020 at 02:26, Sakari Ailus <sakari.ailus@iki.fi> wrote:
>
> Hi Robert,
>
> On Mon, May 11, 2020 at 01:03:49PM +0200, Robert Foss wrote:
> > Add match table, enable ov8856_probe() to support
> > both ACPI and DT modes.
> >
> > ACPI and DT modes are primarily distinguished from
> > by checking for ACPI mode and by having resource like
> > be NULL.
> >
> > Signed-off-by: Robert Foss <robert.foss@linaro.org>
>
> Applied with this small diff --- please check with checkpatch.pl on the
> next time. Thanks!

Thanks Sakari, I appreciate it!

>
> diff --git a/drivers/media/i2c/ov8856.c b/drivers/media/i2c/ov8856.c
> index 1657e03d9a9d..4ca27675cc5a 100644
> --- a/drivers/media/i2c/ov8856.c
> +++ b/drivers/media/i2c/ov8856.c
> @@ -1226,8 +1226,7 @@ static int ov8856_get_hwcfg(struct ov8856 *ov8856, struct device *dev)
>         if (!fwnode)
>                 return -ENXIO;
>
> -       ret = fwnode_property_read_u32(fwnode, "clock-frequency",
> -               &xvclk_rate);
> +       ret = fwnode_property_read_u32(fwnode, "clock-frequency", &xvclk_rate);
>         if (ret)
>                 return ret;
>
> @@ -1244,10 +1243,11 @@ static int ov8856_get_hwcfg(struct ov8856 *ov8856, struct device *dev)
>         }
>
>         if (xvclk_rate != OV8856_XVCLK_19_2)
> -               dev_warn(dev, "external clock rate %d is unsupported", xvclk_rate);
> +               dev_warn(dev, "external clock rate %u is unsupported",
> +                        xvclk_rate);
>
>         ov8856->reset_gpio = devm_gpiod_get_optional(dev, "reset",
> -               GPIOD_OUT_LOW);
> +                                                    GPIOD_OUT_LOW);
>         if (IS_ERR(ov8856->reset_gpio))
>                 return PTR_ERR(ov8856->reset_gpio);
>
> --
> Kind regards,
>
> Sakari Ailus

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply	[flat|nested] 12+ messages in thread
end of thread, other threads:[~2020-05-12  8:13 UTC | newest]

Thread overview: 12+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-05-11 11:03 [PATCH v8 0/3] media: ov8856: Add devicetree support Robert Foss
2020-05-11 11:03 ` Robert Foss
2020-05-11 11:03 ` [PATCH v11 1/3] media: dt-bindings: ov8856: Document YAML bindings Robert Foss
2020-05-11 11:03   ` Robert Foss
2020-05-11 11:03 ` [PATCH v8 2/3] media: ov8856: Add devicetree support Robert Foss
2020-05-11 11:03   ` Robert Foss
2020-05-12  0:25   ` Sakari Ailus
2020-05-12  0:25     ` Sakari Ailus
2020-05-12  8:13     ` Robert Foss
2020-05-12  8:13       ` Robert Foss
2020-05-11 11:03 ` [PATCH v8 3/3] media: ov8856: Implement sensor module revision identification Robert Foss
2020-05-11 11:03   ` Robert Foss

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